Test-plate for roller grinding-mills



(Nq Model.)

W. D, GRAY. TEST PLTE POR ROLLER GRINDING MILLS.

No. 264,45 4. w Patented Sept'.-19, 1882 Ati &s't I Invcdr UNITED STATES PATENT OFFICE.

VVILLIAM D. GRAY, OF MILWAUKEE, WISGONSIN.

TEST-PLATE FOR ROLLER GRlNDlNG-MILLS.

SPECIFICATION forming part of Letters Patent No. 264,454, dated September 19, 1882.

Application filed May 23, 1882. (No model.)

To all whom it may conccm Be it known that I, WILLIAM D. GRAY, of Milwaukee, in the county ot' Milwaukee and State ot' Wisconsin, have invented certain Improvements in Methods of and Means for Leveling Grinding-Rolls, of which the following is a specification. i Roller-mills for reducing grain, as generally made at the present day, consist of rolls ar- IO ranged side by side in pairs. To secure a proper action it is necessary that the space between the rolls shall he uniform from end to end, as otherwise the material will beground finer at one point than at another. To secure this uniforn space it is necessary that the axes of the two rolls shall stand exactly parallel. Owing to the unequal wear of the journals, changes in the adjustment, and other causes, the rolls frequently lose their proper 2o positions, so that readjustment is required. All mills of the better class are provided with means for adjusting or moving the journals ot' the rolls, both vertically and horizontally, to secure and maintain the desired parallelism. In practice, however, much trouble is experienced in determinihg when 'the rolls are parallel, and in dctermining in the course ot' adjustnent the movement necessary for each journal, for when a divergence exists it is difioult to decide whether it is due to a divergence of the rolls in a horizontal or in a vertical direction. In practice l have found that by first binding the rolls so that their axes lie in the same horizontal plane the final adjust- 5 ment to bring the axes in vertical planes which are parallel is greatly facilitated.

To. this end my method consists in resting upon the two rolls a plate or frane having a v true plane surface ot' such size as to bear upon 40 bot-h rolls at or near both ends at the same time. This plate will bear firmly and without rocking upon the two rolls only when their aXes lie in one and the same plane. The slightest (livergence of the rolls in this respect 5 will cause the plate to bear only at two corners, so that itcau rock or tip upon the rolls. This action of the plate not only indicates the divergence of the rolls, but enables the attendant to perceive the exact amount of adjus'tnent required and the'point at which it is needed. By this simple plan, therefore, I am enabled quickly and without removing the rolls to effect an adjustment of extreme accuracy, and this, too, without employing expensive or delicate instruments or exercising special skill. The only essential requirement is ,that the plate shall have its four corners adapted to bear upon the rolls and be located in one and the same plane. It is preferred to make the plate, as shown in the drawings, in which- Figure 1 represents a perspective view of'` the plate as it appears in use; Fig. 2, a crosssection of the plate.

A represents the plate, made rectangular in form, with two parallel edges, a, extended across the body and planed or ground accurately to one and the same p ane. At the center the plate is provided with an opening encircled by a thick flange or "collar from, which ribs b radiate upon the top or back, as shown. The central opening aft'or'ds a convenient hold for the hand in lifting the plate, lessens the weight, and reduces the tendency of the plate to twist and warp. The collar and ribs stitl'en and strengthen the plate and admit of its be- V ing made lighter than would otherwise be admissible. The plate may be made with a plain flat surface throughout its entire area; but the form shown with planed edges is more cheaply produced and answers every requirement.

The right'is reserved to make any and all matters and things which are described and shown, but which are not specitically claimed, the subject matter ot' a separate patent.

Having thus described ny invention, what I claim isi 1. The herein-described method ofadjustin'g the rolls ot' grinding-mills to bring their axes to a common plane, consisting in placing the rolls in an operative position side by side, placing upon the two rolls a plane surface ot' sufficient eXtent to bear upon both ends of both rolls at one time, and finally adjusting the rolls until each is in contact with said surface at both ends.

2. The test-plate for roller-mills, constructed with the depending plaued edges in one and the same plane, said plate adapted for application to two rolls,'as described.

3. The test-plate'for roller-mills, having the plane surface, the opening, and the ribs upon the back.

WILLIAM DIGKSON GRAY.

witnesses:

EDWARD PHELPs ALLIs, J r., J OHAN HovIND.

IOO 

